<template>
    <!-- 底部 -->
    <div class="my-footer">
        <!-- 全选 -->
        <div class="custom-control custom-checkbox">
        <input v-model="flag" type="checkbox" class="custom-control-input" id="footerCheck">
        <label class="custom-control-label" for="footerCheck">全选</label>
        </div>
        <!-- 合计 -->
        <div>
        <span>合计:</span>
        <span class="price">¥ {{price}}</span>
        </div>
        <!-- 按钮 -->
        <button type="button" class="footer-btn btn btn-primary">结算 ( {{count}} )</button>
    </div>
</template>

<script>
export default {
    data(){
        return{
        }
    },
    props:["list"],
    computed:{
        flag:{
            set(val){
                this.list.forEach(item=>item.goods_state=val)
            },
            get(){
                return this.list.every(item=>item.goods_state)
            }
        },
        count:{
            get(){
                let arr=this.list.filter(item=>item.goods_state)
                return arr.reduce((sum,pur)=>{
                    let count=pur.goods_count?pur.goods_count:0
                    return sum+=count
                    },0)
            }
        },
        price:{
            get(){
                let arr=this.list.filter(item=>item.goods_state)
                return arr.reduce((sum,pur)=>{
                    let count=pur.goods_count?pur.goods_count:0
                    return sum+=count*pur.goods_price
                    },0)
            }
        }
    }
}
</script>

<style lang="less" scoped>
.my-footer {
    position: fixed;
    z-index: 2;
    bottom: 0;
    width: 100%;
    height: 50px;
    border-top: 1px solid #ccc;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10px;
    background: #fff;

    .price {
        color: red;
        font-weight: bold;
        font-size: 15px;
    }
    .footer-btn {
        min-width: 80px;
        height: 30px;
        line-height: 30px;
        border-radius: 25px;
        padding: 0;
    }
}
</style>